CN218920111U - Axial motor, power assembly and electric equipment - Google Patents

Axial motor, power assembly and electric equipment Download PDF

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Publication number
CN218920111U
CN218920111U CN202222854078.2U CN202222854078U CN218920111U CN 218920111 U CN218920111 U CN 218920111U CN 202222854078 U CN202222854078 U CN 202222854078U CN 218920111 U CN218920111 U CN 218920111U
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stator
magnetic
slot
stator core
axial motor
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李佩锦
侯继宁
蔺梦轩
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Huawei Digital Power Technologies Co Ltd
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Huawei Digital Power Technologies Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility

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Abstract

The application provides an axial motor, a power assembly and electric equipment, wherein the axial motor comprises an axial motor stator, and the axial motor stator comprises a stator core, a winding wound on the stator core and a magnetic slot wedge; the stator core is provided with stator grooves which are arranged at intervals along the circumferential direction of the stator core, the stator grooves extend along the radial direction of the stator core, and partial windings are positioned in the stator grooves; the magnetic slot wedge is located in the stator slot and extends along the radial direction of the stator core, the magnetic slot wedge is closer to the notch of the stator slot than the partial winding located in the stator slot, the magnetic slot wedge comprises a magnetic conduction section and a magnetism isolating section, the magnetic conduction section is located in the stator slot and is connected with the stator slot along two side slot walls of the stator core in the circumferential direction of the stator core, and the magnetism isolating section is located between the partial magnetic conduction sections. The axial motor in the application is favorable for reducing the magnetic flux leakage of the stator circumference of the axial motor, improves the torque and accordingly improves the power density of the axial motor.

Description

Axial motor, power assembly and electric equipment
Technical Field
The application relates to the technical field of motors, in particular to an axial motor, a power assembly and electric equipment.
Background
The axial motor has the characteristics of high torque density, high power density and the like because of the large air gap plane and compact structure. Compared with the traditional radial motor, the axial motor has obvious application advantages in application scenes with limit requirements on size, weight and the like, and is easy to integrate in occasions with high space utilization rate requirements such as electric automobiles. At present, in an axial motor, a stator slot is generally arranged for placing a winding, a magnetic field is generated after the winding is electrified, and at the moment, part of magnetic flux does not pass through an air gap, but circumferential magnetic flux leakage is generated at a notch of the stator slot, so that larger torque loss is caused, and the working efficiency of the axial motor is affected.
Disclosure of Invention
The application provides an axial motor, a power assembly and electric equipment for reducing stator circumferential magnetic flux leakage.
In a first aspect, the present application provides an axial motor comprising an axial motor stator comprising a stator core, windings wound on the stator core, and magnetic slot wedges; the stator core is provided with stator grooves which are arranged at intervals along the circumferential direction of the stator core, the stator grooves extend along the radial direction of the stator core, and part of the windings are positioned in the stator grooves; the magnetic slot wedge is located in the stator slot and extends along the radial direction of the stator core, the magnetic slot wedge is closer to the notch of the stator slot than the partial winding located in the stator slot, the magnetic slot wedge comprises a magnetic conduction section and a magnetism isolating section, the magnetic conduction section is located in the stator slot and connected with the two side slot walls of the stator slot along the circumference of the stator core, and the magnetism isolating section is located between partial magnetic conduction sections in the circumferential direction of the stator core.
The stator core is used as a part of a magnetic circuit of the motor and used for conducting magnetic force lines, placing and supporting windings, and is sleeved on the motor shaft of the axial motor and integrally surrounds the motor shaft.
The magnetic slot wedge is arranged in the stator slot and is positioned in the notch of the stator slot, and the winding is closer to the bottom of the stator slot than the magnetic slot wedge. The magnetic slot wedge comprises a magnetic conduction section and a magnetism isolating section, wherein the magnetic conduction section is favorable for magnetic conduction, and provides a magnetic conduction path for magnetic lines of force generated by the winding during operation. Because for winding the winding, a stator groove is formed on the stator core in a slotting way, part of the stator core in the stator groove is removed, the magnetic conduction performance is reduced, and the magnetic conduction section is arranged in the stator groove, so that the magnetic conduction part is increased, and the magnetic conduction performance is improved. Wherein, both sides wall along the circumference of stator core all is connected with partial magnetic conduction section in the stator groove, and wherein the partial magnetic conduction section that is connected with stator groove one side is used for making up the magnetic conduction part of stator tooth of homonymy for the magnetic line of force that the winding produced can get into the air gap through this partial magnetic conduction section, and then promotes magnetic conduction effect, promotes the air gap magnetic flux.
The magnetism isolating section is used for blocking magnetic force line transmission so as to avoid magnetic force lines on two sides of the stator slot from mutual crosstalk. In the circumferential direction of the stator core, the magnetism isolating section is positioned between partial magnetism conducting sections on two sides, so that partial magnetism conducting sections are arranged between the magnetism isolating section and the groove wall on one side of the stator groove, more magnetic force lines enter an air gap, air gap magnetic flux is promoted, and further torque of the axial motor can be promoted.
In the implementation scheme, the magnetic slot wedge is arranged, so that the winding can be tightly pressed in the stator slot on one hand, and the winding is prevented from being displaced in the stator slot to cause mechanical abrasion; on the other hand, the magnetic slot wedge is divided into a magnetic conduction section and a magnetism isolating section, wherein the magnetic conduction section is more beneficial to magnetic force line circulation than air, so the magnetic slot wedge has the function of guiding magnetic flux, the magnetic flux loss is reduced, and the magnetism isolating section in the magnetic slot wedge can prevent magnetic force lines generated by windings from entering adjacent stator teeth through the magnetic slot wedge along two sides in the circumferential direction, so that magnetic crosstalk between the adjacent stator teeth is prevented. The magnetic conducting section and the magnetism isolating section of the magnetic slot wedge are matched together to improve the density of magnetic force lines generated by the winding entering the air gap.
In the application, through the arrangement of the magnetic slot wedge in the axial motor, firstly, the magnetic force lines generated by the winding are led by the magnetic conduction section of the magnetic slot wedge to enter the air gap, so that the magnetic flux density of the air gap is increased, the waveform of the magnetic flux density of the air gap is close to sine wave, the output torque can be increased, the torque fluctuation is reduced, and the problem of circumferential magnetic leakage at the notch of the stator slot is effectively solved;
secondly, two sides of the magnetic conduction section are connected with the groove walls of the stator grooves, which is equivalent to increasing the effective sectional area of the stator teeth, thereby being beneficial to reducing magnetic resistance and increasing magnetic conduction paths;
Third, the magnetism section that separates of magnetism slot wedge is located between partial magnetic conduction section in the circumference of stator core, can avoid the magnetic field interference in the adjacent stator tooth, simultaneously, sets up and separates the whole intensity that magnetism slot wedge is favorable to guaranteeing for magnetism slot wedge receives external environment influence less.
This application is through adopting the magnetism slot wedge in axial motor stator to divide into magnetic conduction section and magnetism isolation section with the magnetism slot wedge, make the magnetism slot wedge when guiding magnetic flux, avoid magnetism to cross talk, and promote the intensity of magnetism slot wedge, be favorable to reducing the circumference magnetic leakage of stator groove, and then promote axial motor's work efficiency.
In one possible implementation manner, adhesive glue is filled between the magnetic conduction section and the slot wall of the stator slot, so that the reliability of connection between the magnetic conduction section and the stator slot is enhanced, and the structural strength of the axial motor stator is enhanced.
In one possible implementation, the stator core includes a plurality of stator teeth arranged at intervals in a circumferential direction of the stator core, and a stator yoke located at one end of the stator teeth in an axial direction. The stator yoke is used for fixing the stator teeth, and improves the structural strength of the stator teeth in the circumferential direction of the stator core.
In one possible implementation, the stator core is of unitary construction, disposed around the axis of the axial motor, and the stator teeth are integrally formed with the stator yoke. The structural strength of the whole stator core is improved, and stator grooves are formed by uniformly slotting the stator core along the circumferential direction, namely, the gaps between two adjacent stator teeth are the stator grooves. The winding is wound in the stator slot and distributed on the periphery of the stator core to form a distributed winding, and a part of the stator core positioned on one side of the slot bottom of the stator slot forms a stator yoke. The winding is arranged in the stator slot, so that the winding and the stator core are wound more firmly, and the overall structural strength of the axial motor stator is improved. The circumferential direction of the stator core refers to the circumferential direction of the axial direction of the stator core, the stator core and the axial motor are coaxially arranged, and the axial direction of the stator core is the axial direction of the axial motor.
In one possible implementation, the stator teeth are provided separately from the stator yoke for fixing the stator teeth such that a plurality of the stator teeth are fixed relatively in the circumferential direction with the stator slots between adjacent two of the stator teeth. Winding a winding around each stator core to form a wound winding. In an implementation manner, the stator yoke is annular, a through hole penetrating the stator yoke is formed in the circumferential direction, and one end of the stator tooth penetrates through the through hole, so that a plurality of stator teeth are arranged at intervals in the circumferential direction. In other implementations, the stator yoke may have other structures as long as the stator teeth can be fixed in the circumferential direction.
In one possible implementation, the winding is a flat wire winding. Compared with a round wire winding, the slot filling rate of the flat wire winding is high, namely, the gap left when the flat wire winding is positioned in the stator slot is smaller, so that the risk of magnetic flux leakage of the magnetic force lines of the winding from the slots in the stator slot can be reduced, the axial motor adopting the flat wire winding has relatively higher efficiency, and the high slot filling rate of the flat wire winding enables the heat dissipation performance of the flat wire winding to be better, and the efficiency of the axial motor can be improved. However, because the size of the flat wire winding is larger, the requirement on the opening width of the stator slot is correspondingly higher, so that the magnetic leakage at the slot opening is serious, and the problem of the circumferential magnetic leakage of the slot opening of the stator slot of the flat wire winding can be effectively solved by adopting the magnetic slot wedge in the application, so that the magnetic slot wedge and the flat wire winding can be mutually matched with each other efficiently, and the power density of the axial motor is jointly improved. Wherein the flat wire winding includes, but is not limited to, the following types: lap windings, concentric windings, wave windings, chain windings or cross windings. In other implementations, the windings may also be round wire windings where axial electrode power requirements are met.
In one possible embodiment, the dimension of the magnetism isolating section in the circumferential direction of the stator core gradually increases from the notch of the stator slot to the slot bottom of the stator slot. In this implementation, an air gap is provided between the axial motor stator and the rotor, and magnetic lines of force generated in the axial motor stator enter the rotor through the air gap, and one side of the magnetic conducting section and the magnetism isolating section away from the bottom of the stator slot is adjacent to the air gap. The circumferential dimension of one end of the magnetic isolation section far away from the air gap is larger than the circumferential dimension of one end of the magnetic isolation section close to the air gap, on one hand, under the condition that the dimension of one end of the magnetic slot wedge facing the air gap is unchanged in the circumferential direction of the stator core, the smaller the circumferential dimension of one end of the magnetic isolation section close to the air gap is, the larger the circumferential dimension of one end of the magnetic conduction section close to the air gap is compared with the magnetic isolation section, the magnetic conduction section is helped to guide magnetic flux to enter the rotor through the air gap, so that the density of magnetic force lines generated by the winding entering the air gap is improved, and the circumferential magnetic leakage is reduced; on the other hand, the circumferential dimension of the magnetic conduction section greatly indirectly widens the circumferential dimension of the stator teeth connected with the magnetic conduction section, and is beneficial to reducing magnetic resistance.
In one possible implementation, the circumferential dimension value of the magnetism isolating section increases linearly from the notch of the stator slot to the slot bottom of the stator slot. The magnetic conductivity is more uniform, and torque fluctuation is reduced. In other implementations, the trend of the circumferential dimension value of the magnetism isolating segment from the notch of the stator slot to the slot bottom of the stator slot includes, but is not limited to, the following types: nonlinear increment, linear decrement, nonlinear decrement, increment-by-decrement, decrement-by-increment-unchanged.
In one possible implementation, the size of the magnetic slot wedge in the circumferential direction of the stator core becomes gradually larger from inside to outside in the radial direction of the stator core. The stator core has an annular structure from inside to outside, which means from an inner circumferential surface of the stator core to an outer circumferential surface of the stator core in a radial direction of the stator core. The size value of the magnetic slot wedge in the circumferential direction of the stator core increases gradually from inside to outside along the radial direction of the stator core, the increasing mode can be linear increasing or nonlinear increasing, the size of a section of the magnetic slot wedge close to the inner circumferential surface of the stator core is unchanged, the size of a section of the magnetic slot wedge close to the outer circumferential surface of the stator core increases gradually, and only if the condition is satisfied, the circumferential size of one end of the magnetic slot wedge close to the outer circumferential surface of the stator core is larger than the circumferential size of one end of the magnetic slot wedge close to the inner circumferential surface of the stator core. When the size value of the magnetic slot wedge in the circumferential direction of the stator core increases linearly, the stator slot and the magnetic slot wedge processing technology is simpler.
In one possible implementation, the size of the stator teeth between two adjacent stator slots in the circumferential direction of the stator core gradually increases from inside to outside in the radial direction of the stator core, and the size change of the magnetic slot wedges in the circumferential direction of the stator core is the same as the size change of the stator teeth. The magnetic slot wedge is matched with the change of the circumferential dimension of the stator teeth, so that the magnetic conduction effect of the magnetic slot wedge is enhanced.
In one possible implementation manner, the stator slot includes a winding accommodating portion and a slot wedge accommodating portion that are distributed along an axial direction of the stator core, the winding accommodating portion is used for accommodating a portion of the winding, the slot wedge accommodating portion is used for accommodating the magnetic slot wedge, a size of the magnetic slot wedge and the slot wedge accommodating portion in a circumferential direction of the stator core gradually increases from inside to outside along a radial direction of the stator core, and the magnetic conduction sections are connected with an inner wall of the slot wedge accommodating portion along two sides of the circumferential direction of the stator core. According to the scheme, the magnetic slot wedge and the slot wedge accommodating part are matched with the change of the circumferential dimension of the stator tooth, so that the magnetic conduction effect of the magnetic slot wedge is enhanced.
In one possible implementation, the dimension of the winding housing in the circumferential direction of the stator core remains unchanged in the radial direction of the stator core. The scheme ensures that the winding positioned at the winding accommodating part does not displace, and the firmness of the winding on the stator core is improved.
In one possible implementation, the size of the winding receiving portion in the circumferential direction of the stator core is the same as or different from the size of the slot wedge receiving portion in the circumferential direction of the stator core. When the winding and wedge accommodating parts are identical, the processing technology is simpler, and the winding accommodating parts and the wedge accommodating parts can be formed through slotting at the same time; when the slot wedges are different, the size of the slot wedge accommodating part in the circumferential direction of the stator core can be set to be larger than the size of the winding accommodating part in the circumferential direction of the stator core, so that the slot wedges are beneficial to the diversified design, and the sizes and the shapes of the magnetic conduction sections and the magnetic isolation sections can be set according to the magnetic conduction and magnetic isolation effects by way of example; on the other hand, the structure which is beneficial to the arrangement of the circumferential side walls of the magnetic slot wedge and the stator slot and increases the structural strength is beneficial to the arrangement of the circumferential side walls of the magnetic slot wedge and the stator slot.
In one possible implementation manner, the stator groove is provided with first clamping portions along two side groove walls of the stator core in the circumferential direction, the magnetic conduction section is provided with second clamping portions along two sides of the stator core in the circumferential direction, and the first clamping portions are in clamping connection with the second clamping portions. The stator core and the magnetic slot wedge can be connected firmly through the clamping connection of the first clamping part and the second clamping part, and the structural strength is improved. In this implementation manner, the first clamping portion and the second clamping portion are matched in shape, and illustratively, the first clamping portion is a concave portion, the second clamping portion is a convex portion, or, the first clamping portion is a convex portion, the second clamping portion is a concave portion, and the first clamping portion and the second clamping portion are clamped to improve the overall strength of the stator core. During assembly, the winding is firstly installed in the stator slot, then the magnetic slot wedge is pushed in the stator slot from outside to inside along the radial direction of the stator core, the first clamping part and the second clamping part can be coated with adhesive in advance, after the first clamping part and the second clamping part are completely clamped, the adhesive bonds the first clamping part and the second clamping part, the structural reliability of the axial motor stator is enhanced, the structural strength is improved, and in other implementations, the first clamping part and the second clamping part can be connected in a pin, a buckle, a screw and other connection modes.
In one possible implementation manner, the magnetic conduction section includes two magnetic conduction subsections, the two magnetic conduction subsections are respectively connected with two side groove walls of the stator groove along the circumferential direction of the stator core, and the magnetism isolating section is located between the two magnetic conduction subsections in the circumferential direction of the stator core. In this implementation mode, two magnetic conduction subsections are respectively connected with different stator teeth for promote the magnetic conduction performance in the stator teeth of stator slot both sides. The dimension value of the magnetism conducting sub-section in the axial direction of the stator core is equal to the dimension value of the magnetism isolating section in the axial direction of the stator core, and one side of the magnetism isolating section, which is close to the bottom of the stator slot, is contacted with the winding.
In one possible implementation manner, the side surface of the magnetism isolating section connected with the magnetic conduction sub-section is a plane, and the position of the magnetism isolating section connected with the magnetic conduction sub-section is in a straight line shape when seen from the end surface of the magnetism isolating section and the magnetic conduction sub-section. The scheme is favorable for reducing the processing difficulty of the magnetic slot wedge.
In one possible implementation manner, the side surface of the magnetism isolating section connected with the magnetic conduction sub-section is an irregular surface, and the position of the magnetism isolating section connected with the magnetic conduction sub-section is in a nonlinear shape when seen from the end surface of the magnetism isolating section and the magnetic conduction sub-section. Illustratively, the positions where the magnetism isolating sections are connected with the magnetic conducting subsections are fold lines or arcs as seen from the end surfaces of the magnetism isolating sections and the magnetic conducting subsections. The side that separates magnetism section and magnetic conduction subsection to be connected is irregular surface, compares in the plane, separates the area of contact between magnetism section and the magnetic conduction subsection bigger for separate magnetism section and magnetic conduction subsection to be connected more firmly, be favorable to promoting the bulk strength of magnetism slot wedge.
In one possible implementation, the surface of the magnetic conduction section near the slot opening of the stator is provided with a groove, and the magnetism isolating section is positioned in the groove.
In the implementation mode, part of the magnetic conduction sections in the groove, which are close to two sides of the groove wall, are positioned at two sides of the magnetism isolating section along the circumferential direction of the stator core, the bottom of the magnetic conduction section is abutted with the winding, or the part of the magnetic conduction section corresponding to the groove bottom of the groove is abutted with the winding. The dimension value of the magnetic conduction section in the axial direction of the stator core is larger than that of the magnetism isolating section in the axial direction of the stator core. And the grooves are formed in the magnetic conduction sections, so that the processing and manufacturing difficulty of the magnetic slot wedge is reduced.
In the implementation mode, an adhesive is filled between the grooves of the magnetism isolating section and the magnetism conducting section so as to enhance the reliability of connection between the magnetism isolating section and the magnetism conducting section. In this implementation, the end face of the groove is an arc, and the cross section of the groove is an arc. The processing of the magnetic conduction section is facilitated, the surface of the magnetic conduction section, facing the groove, is more beneficial to being added into an arc shape, the magnetic conduction section is more attached to the connecting surface of the groove, and the connecting strength is higher. In other implementations, the groove end faces or cross-sections of the grooves may be irregularly curved, triangular, or trapezoidal.
In one possible implementation, the magnetically conductive segment has anisotropy, and an angle value of an easy axis of the magnetically conductive segment and an axial direction of the stator core is less than or equal to 60 degrees. The magnetic slot wedge is arranged to have anisotropy, so that circumferential magnetic leakage can be reduced to the greatest extent, axial magnetic flux in an air gap is fully utilized, and the power density of the axial motor is improved.
The anisotropy refers to a property that all or part of chemical, physical and other properties of a substance change with a change in direction, and the property shows a difference in different directions. Magnetic anisotropy refers to the phenomenon in which the magnetic properties of a substance change with direction. The easy axis means a direction in which a substance having magnetic anisotropy is preferentially magnetized when magnetized. The detection method of the easy axis comprises the following steps: and (3) placing the object to be measured in an alternating magnetic field along 360 degrees, and measuring the magnetic field intensity value or the magnetic flux value of the object to be measured before and after the object to be measured is placed in the alternating magnetic field, wherein the direction corresponding to the maximum change of the magnetic field intensity value or the magnetic flux value of the alternating magnetic field is the direction of the easy axis.
In this implementation, the anisotropic conductive segments are made from anisotropic magnetic powder in combination with a molding technique. The anisotropic magnetic powder is a soft magnetic composite material, such as a planar anisotropic material of yttrium iron silicon YFeSi, cerium iron nitrogen CeFeN and the like, and can guide magnetic flux to a specific direction, and the magnetic loss is extremely low due to different magnetic directions. The mould pressing technology is to mix and compact the magnetic powder and the non-magnetic heat-resistant adhesive, and press the mixture into any shape and number of layers. Among them, heat-resistant adhesives include, but are not limited to, epoxy-based, phenolic-based, silicone-based, and heterocyclic-based adhesives. In this implementation manner, the material of the magnetism isolating section may be a heat-resistant adhesive or a high-temperature adhesive, a plasticizer, or the like. The magnetic permeability of the magnetism isolating section is lower than that of the magnetism conducting section.
In the implementation mode, the included angle between the easy axis of the magnetic conduction section and the axial direction of the stator core is smaller than or equal to 60 degrees, and magnetic force lines generated by the winding can be guided to deviate towards adjacent stator teeth after passing through the magnetic conduction section, so that the magnetic density waveform of an air gap is close to a sine wave, the magnetic leakage of the notch of a stator slot is reduced, and the output torque is increased.
In one possible implementation manner, the magnetic conduction section includes two magnetic conduction subsections, the two magnetic conduction subsections are respectively recorded as a first magnetic conduction subsection and a second magnetic conduction subsection, wherein the first magnetic conduction subsection is arranged adjacent to a first stator tooth on the left side of the stator slot, the second magnetic conduction subsection is arranged adjacent to a second stator tooth on the right side of the stator slot, an easy axis of the first magnetic conduction subsection forms an included angle with the axial direction of the stator core and is biased towards the first stator tooth, an easy axis of the second magnetic conduction subsection forms an included angle with the axial direction of the stator core and is biased towards the second stator tooth, the first magnetic conduction subsection can guide magnetic lines of force to be close to the first stator tooth, so that magnetic lines of force in the first stator tooth are more gathered, the second magnetic conduction subsection can guide magnetic lines of force to be close to the second stator tooth, so that magnetic lines of force in the second stator tooth are more gathered, the magnetic line density is closer to sine, and the power density of the axial motor is improved.
In one possible implementation, the easy axis of the magnetically permeable segment is the same as the axial direction of the stator core. At the moment, the angle value of the included angle between the easy axis of the magnetic conduction section and the axial direction of the stator core is 0, so that the process preparation is facilitated, the processing is facilitated, and the testing is facilitated.
In one possible implementation manner, a portion of the magnetic conductive section located between a slot wall of the stator slot and the magnetism isolating section includes a first magnetic conductive portion and a second magnetic conductive portion, and the second magnetic conductive portion is located between the first magnetic conductive portion and the magnetism isolating section in a circumferential direction of the stator core; in the terminal surface or the cross section of magnetism slot wedge, the easy axle of first magnetic conduction portion with the easy axle of second magnetic conduction portion is all kept away from separate magnetism section direction skew the axial of stator core, the easy axle of second magnetic conduction portion with the contained angle between the axial of stator core is greater than the easy axle of first magnetic conduction portion with the contained angle between the axial of stator core.
In this implementation manner, the magnetic conductive section has the function of guiding magnetic force lines, and the easy axis of the first magnetic conductive portion and the easy axis of the second magnetic conductive portion are the direction of magnetic force line offset, so that the magnetic force lines deviate from the axial direction of the stator core in the direction away from the magnetic isolation section after passing through the first magnetic conductive portion and the second magnetic conductive portion. The first magnetic conduction part is positioned between the stator teeth and the second magnetic conduction part, the second magnetic conduction part is deviated from the stator teeth in the circumferential direction of the stator core compared with the first magnetic conduction part, in the implementation mode, the included angle between the easy axis of the first magnetic conduction part and the axial direction of the stator core is smaller than the included angle between the easy axis of the second magnetic conduction part and the axial direction of the stator core, so that magnetic force lines conducted by the second magnetic conduction part deviate towards the stator teeth, magnetic force lines generated by the windings are concentrated more, the magnetic density waveform passing through an air gap is close to a sine wave, the output torque can be increased, and the torque fluctuation is reduced.
In one possible implementation, when the magnetism isolating section is located in the groove in the magnetism conducting section, an angle that an easy axis of a part of the magnetism conducting section close to the magnetism isolating section deviates from an axial direction of the stator core towards a groove wall direction of the stator groove is larger than an angle that an easy axis of a part of the magnetism conducting section far away from the magnetism isolating section deviates from the axial direction of the stator core. The magnetic force lines conducted by the part of the magnetic conduction section close to the magnetism isolating section are offset towards the stator teeth, so that the magnetic force lines generated by the winding are concentrated, the magnetic density waveform passing through the air gap is close to sine waves, the output torque can be increased, and the torque fluctuation is reduced.
In one possible implementation manner, the stator slot penetrates through two ends of the stator core in the axial direction, two magnetic slot wedges are arranged in the stator slot, part of the winding is located between the two magnetic slot wedges, and the two magnetic slot wedges are respectively connected with the slot walls of the stator slot.
This implementation mode is applicable to the condition that axial motor includes an axial motor stator and two rotors, and two rotors are all installed on the motor shaft and with motor shaft fixed connection, and two rotors are located axial motor stator along motor shaft axial both sides, and axial motor stator and two coaxial settings of rotor all have the air gap between axial motor stator and the two rotors, and one side that two magnetism slot wedges kept away from the winding all with the air gap direct contact, the magnetic force line that the winding produced gets into the rotor through the air gap.
In this implementation, two magnetic slot wedges compress the windings from both sides of the stator core in the axial direction of the stator core, preventing the windings from being displaced in the stator slots. During assembly, the winding is firstly installed in the stator slot, then the two magnetic slot wedges are respectively pushed in the radial direction of the stator core from outside to inside at the two notch positions of the stator slot, and after the first clamping position part and the second clamping position part are completely clamped, the adhesive is filled between the first clamping position part and the second clamping position part, so that the structural reliability of the axial motor stator is enhanced, and the structural strength is improved. According to the implementation mode, the magnetic slot wedges are respectively arranged on two sides of the stator slot along the axial direction, so that magnetic force lines generated by the winding can be guided to be gathered by the magnetic slot wedges along the axial direction of the stator core, and the air gap flux density is increased.
In a second aspect, the present application provides a power assembly, the power assembly includes gearbox and axial motor according to any one of the implementation manners of the first aspect, the axial motor still includes fixed connection's axial motor rotor and motor shaft, the axial motor rotor with the axial motor stator is followed the axial of motor shaft is arranged and all overlaps and is located the motor shaft, the axial motor rotor with the motor shaft all can be relative the axial motor stator rotates, the motor shaft with the power input shaft transmission of gearbox is connected, is used for to power input shaft output power.
In a third aspect, the present application provides an electric device, including a device body and an axial motor according to any implementation of the first aspect, where the axial motor is mounted to the device body; or the electrically powered device comprises a device body and a powertrain as described in the second aspect, the powertrain being mounted to the device body.
Drawings
In order to more clearly describe the technical solutions in the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be described below.
FIG. 1 is a schematic diagram of a powertrain according to one embodiment of the present disclosure;
FIG. 2 is a schematic structural diagram of an electromotive device according to an embodiment of the present application;
FIG. 3 is a schematic structural view of an axial motor according to an embodiment of the present disclosure;
FIG. 4 is a schematic structural view of an axial motor stator according to an embodiment of the present disclosure;
FIG. 5 is an exploded view of an axial motor stator provided in an embodiment of the present application;
FIG. 6 is a schematic illustration of a magnetic slot wedge provided in an embodiment of the present application;
fig. 7 is a schematic structural view of a stator core according to an embodiment of the present disclosure;
FIG. 8 is a schematic view of a portion of a stator tooth and stator yoke according to another embodiment of the present application;
FIG. 9 is an enlarged view of a portion of an axial motor stator provided in an embodiment of the present application;
FIG. 10 is a schematic view of a partial structure of a magnetic slot wedge, stator core and rotor provided in an embodiment of the present application;
FIG. 11 is a top view of a magnetic slot wedge and stator teeth along an axial direction of a stator core provided in an embodiment of the present application;
FIG. 12 is an enlarged view of a portion of a stator core and a magnetic slot wedge provided in an embodiment of the present application;
FIG. 13 is an enlarged view of a portion of a stator core provided in an embodiment of the present application;
FIG. 14 is a schematic illustration of a connection of a stator slot to a magnetic slot wedge according to one embodiment of the present application;
FIG. 15 is a schematic illustration of a connection of a stator slot to a magnetic slot wedge provided in accordance with another embodiment of the present application;
FIG. 16 is a schematic view of a magnetic slot wedge end face provided in an embodiment of the present application;
FIG. 17 is an enlarged view of a portion of an axial motor stator provided in an embodiment of the present application;
FIG. 18 is a schematic view of a magnetic slot wedge end face provided in an embodiment of the present application;
FIG. 19 is a schematic view of a magnetic slot wedge end face provided in an embodiment of the present application;
FIG. 20 is a schematic view of a magnetic slot wedge end face provided in an embodiment of the present application;
FIG. 21 is an enlarged view of a portion of an axial motor stator provided in an embodiment of the present application;
FIG. 22 is a schematic view of a magnetic slot wedge end face provided in an embodiment of the present application;
FIG. 23 is a schematic view of a magnetic slot wedge end face provided in an embodiment of the present application;
FIG. 24 is a schematic view of a magnetic slot wedge end face provided in an embodiment of the present application;
FIG. 25 is a schematic view of a stator tooth and magnetic slot wedge end face configuration provided in an embodiment of the present application;
FIG. 26 is a schematic view of a magnetic slot wedge end face provided in an embodiment of the present application;
FIG. 27 is a schematic view of a magnetic slot wedge end face provided in an embodiment of the present application;
FIG. 28 is a schematic view of a stator tooth and magnetic slot wedge end face configuration provided in an embodiment of the present application;
fig. 29 is a schematic structural view of an axial motor stator according to an embodiment of the present disclosure.
Detailed Description
The following description of the technical solutions in the embodiments of the present application will be made with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments.
The terms "first," "second," and the like herein are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
Furthermore, herein, the terms "upper," "lower," and the like, are defined with respect to the orientation in which the structure is schematically disposed in the drawings, and it should be understood that these directional terms are relative concepts, which are used for descriptive and clarity with respect thereto and which may be varied accordingly with respect to the orientation in which the structure is disposed.
For convenience of understanding, the following explains and describes the english abbreviations and related technical terms related to the embodiments of the present application.
Groove filling rate: the proportion of space in the slot is occupied after the winding is arranged in the stator slot;
an outer circumferential surface: refers to the outer surface surrounding the circumferential direction of the component;
an inner circumferential surface: refers to the inner surface of the surrounding part in the circumferential direction;
soft magnetic composite material: SMC, namely soft magnetic composite, the soft magnetic composite material is a soft magnetic material formed by uniformly dispersing magnetic particles in a non-magnetic substance;
anisotropy: refers to a property in which all or part of the chemical, physical, etc. properties of a substance change with a change in direction, and exhibit differences in different directions. Magnetic anisotropy refers to the phenomenon in which the magnetic properties of a substance change with direction.
Easy axis: a substance having magnetic anisotropy requires a small magnetic field for magnetization to reach saturation magnetization in a certain specific direction, i.e., for easy magnetization to reach saturation, the easiest magnetization direction being called the easy axis.
The application provides an axial motor, which comprises an axial motor stator, wherein the axial motor stator comprises a stator core, a winding wound on the stator core and a magnetic slot wedge; the stator core is provided with stator grooves which are arranged at intervals along the circumferential direction of the stator core, the stator grooves extend along the radial direction of the stator core, and partial windings are positioned in the stator grooves; the magnetic slot wedge is located in the stator slot and extends along the radial direction of the stator core, the magnetic slot wedge is closer to the notch of the stator slot than the partial winding located in the stator slot, the magnetic slot wedge comprises a magnetic conduction section and a magnetism isolating section, the magnetic conduction section is located in the stator slot and is connected with the stator slot along two side slot walls of the stator core in the circumferential direction of the stator core, and the magnetism isolating section is located between the partial magnetic conduction sections. The axial motor in the application is favorable for reducing the magnetic flux leakage of the stator circumference of the axial motor, improves the torque and accordingly improves the power density of the axial motor.
The axial motor can be applied to electric equipment or a power assembly, wherein the power assembly comprising the axial motor can also be applied to the electric equipment.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a power assembly 1 according to an embodiment of the present application, where the power assembly 1 includes a gearbox 10 and an axial motor 3 (as shown in fig. 1), and the axial motor 3 is in driving connection with a power input shaft 100 of the gearbox 10 and is configured to output power to the power input shaft 100. In the present embodiment, the gearbox 10 in the powertrain 1 and the axial motor 3 may be separate or integrated. Wherein the motor shaft 31 of the axial motor 3 is fixedly connected with the power input shaft 100 of the gearbox 10, so that the power of the axial motor 3 is transmitted to the power input shaft 100.
In one possible implementation, a wheel drive shaft 101 is provided within the gearbox 10, the wheel drive shaft 101 providing power to the wheels upon receiving power output by the axial motor 3. In the present embodiment, a gear member (not shown in the drawings) is provided in the transmission case 10 to achieve power transmission between the axial motor 3 and the wheel drive shaft 101. In the present embodiment, the powertrain 1 is applied to a vehicle to power the vehicle. In some embodiments, the power assembly 1 may be applied to other electric devices, and the power output by the axial motor 3 is provided to the other electric devices through the gearbox 10 after being changed in speed, so as to provide power for the electric devices. The gear structure or transmission structure within the gearbox 10 may be provided according to the requirements of the electric machine or vehicle.
In one possible implementation, the powertrain 1 further comprises an engine 11 and a generator 12, the engine 11 being in driving connection with the further power input shaft 100 in the gearbox 10 for outputting power to said further power input shaft 100, the generator 12 being in driving connection with the engine 11 via gear parts in the gearbox 10. The power output from the engine 11 is transmitted to the generator 12 through the transmission 10, and the generator 12 generates electricity and is used to store the electric energy in the power battery, and charge the power battery. It should be noted that, in fig. 1, the powertrain 1 is provided to include an engine 11 and a generator 12, and the powertrain 1 is a hybrid system, and in some embodiments, the engine 11 and the generator 12 may not be provided, and only the axial motor 3 and the gearbox 10 may be included, where the powertrain 1 is a pure electric system.
In one possible implementation, the powertrain 1 further includes at least one of MCU, OBC, DC-DC, PDU and BCU. Wherein the MCU is a motor controller, and English is called Motor Control Unit; OBC is an On-vehicle Charger, and English is called On-Board Charger; the DC-DC is a direct current converter; PDU is a power distribution unit, and English is called Power Distribution Unit; BCU is a battery control unit, english full name Battery Control Unit. Wherein the powertrain 13 may integrate at least one of the above components as desired.
Referring to fig. 2, fig. 2 is a schematic structural diagram of an electric device 2 according to an embodiment of the present application, where the electric device 2 includes a device body 20 and a power assembly 1, and the power assembly 1 is mounted on the device body 20. In some embodiments, the electrically powered device 2 includes a device body 20 and an axial motor 3, the axial motor 3 being mounted on the device body 20.
The Electric device 2 includes a Vehicle, a robot, a train of a motor train unit, a ship, a spacecraft, or other forms of driving devices, wherein the Vehicle includes an Electric Vehicle/Electric Vehicle (EV), a pure Electric Vehicle (Pure Electric Vehicle/BatteryElectric Vehicle, PEV/BEV), a hybrid Electric Vehicle (Hybrid Electric Vehicle, HEV), an extended range Electric Vehicle (Range Extended Electric Vehicle, REEV), a Plug-in hybrid Electric Vehicle (Plug-in Hybrid Electric Vehicle, PHEV), a new energy Vehicle (New Energy Vehicle), and the like. In some embodiments, the vehicle includes a passenger car, various special work vehicles having specific functions, such as an engineering rescue vehicle, a sprinkler, a sewage suction vehicle, a cement mixer vehicle, a crane vehicle, a medical vehicle, and the like.
Illustratively, as shown in fig. 2, the electric device 2 is a vehicle, the electric device 2 further includes wheels 21, the wheels 21 are mounted on the device body 20, and the axial motor 3 is in driving connection with the wheels 21 for driving the wheels 21 to run.
The axial motor 3 of the present application is described in detail below.
Referring to fig. 3, fig. 3 is a schematic structural diagram of an axial motor 3 according to an embodiment of the present application, and an embodiment of the present application provides an axial motor 3, where the axial motor 3 includes a rotor 30, a motor shaft 31 and an axial motor stator 4, the axial motor stator 4 is mounted on the motor shaft 31 and is rotationally connected with the motor shaft 31, and the rotor 30 is mounted on the motor shaft 31 and is fixedly connected with the motor shaft 31. When alternating current is supplied to the windings of the axial motor stator 4, the generated alternating magnetic flux interacts with the permanent magnetic flux generated by the rotor 30, so that the rotor 30 rotates relative to the axial motor stator 4. The rotor 30 is fixedly connected with the motor shaft 31, so that the motor shaft 31 rotates along with the rotor 30, and the axial motor stator 4 is rotationally connected with the motor shaft 31, so that the motor shaft 31 can rotate relative to the axial motor stator 4. When the axial motor 3 is in operation, the axial motor stator 4 is stationary and the rotor 30 and the motor shaft 31 rotate synchronously. Wherein the output end of the motor shaft 31 is used for driving external components to rotate, for example, the output end of the motor shaft 31 is in transmission connection with the power input shaft 100 of the gearbox 10, the motor shaft 31 drives the power input shaft 100 to rotate, and the wheel driving shaft 101 is driven to rotate through a gear assembly in the gearbox 10 so as to drive wheels to run.
In the present embodiment, the axial motor stator 4 and the rotor 30 are coaxially disposed in the axial direction O, and an air gap Q (shown in fig. 3) exists between the axial motor stator 4 and the rotor 30. The alternating magnetic flux generated by the axial motor stator 4 interacts with the permanent magnetic flux generated by the rotor 30 in the air gap Q to drive the rotor 30 to rotate, thereby lifting the magnetic flux of the alternating magnetic flux generated by the axial motor stator 4 into the air gap Q, which is beneficial to lifting the torque of the axial motor 3.
In one embodiment, the axial motor 3 comprises a housing, which is located outside the axial motor stator 4, and an end cap (not shown) located on the side of the rotor 30 remote from the axial motor stator 4. The end cap is fixed to the housing and the rotor 30 is located between the end cap and the axial motor stator 4.
In the axial motor 3 shown in fig. 3, two rotors 30 are included, and in some embodiments only one rotor 30 or more rotors 30 and more axial motor stators 4 may be included, as may be desired.
Referring to fig. 4 to 6, fig. 4 is a schematic structural diagram of an axial motor stator 4 according to an embodiment of the present application, fig. 5 is an exploded view of the axial motor stator 4 according to an embodiment of the present application, and fig. 6 is a schematic structural diagram of a magnetic slot wedge 600 according to an embodiment of the present application. An axial motor stator 4 provided in an embodiment of the present application includes a stator core 400, a winding 500 wound on the stator core 400, and a magnetic slot wedge 600 (as shown in fig. 4 and 5); the stator core 400 is provided with stator slots 410 (as shown in fig. 5) arranged at intervals along the circumferential direction C of the stator core 400, the stator slots 410 extend in the radial direction R of the stator core 400, and the partial windings 500 are located in the stator slots 410 (as shown in fig. 4); the magnetic slot wedge 600 is located in the stator slot 410 and extends in the radial direction R of the stator core 400 (as shown in fig. 4), the magnetic slot wedge 600 is closer to the notch of the stator slot 410 than the partial winding 500 located in the stator slot 410, the magnetic slot wedge 600 includes a magnetic conduction section 610 and a magnetism blocking section 620 (as shown in fig. 6), the magnetic conduction section 610 is located in the stator slot 410 and is connected with both side slot walls of the stator slot 410 along the circumferential direction C of the stator core 400, and the magnetism blocking section 620 is located between the partial magnetic conduction sections 610 in the circumferential direction C of the stator core 400.
The stator core 400 is used as a part of a magnetic circuit of the motor for conducting magnetic force lines and for placing and supporting the winding 500, the stator core 400 is used for being sleeved on the motor shaft 31 of the axial motor 3, and the stator core 400 integrally surrounds the motor shaft 31 and is annular.
Referring to fig. 7, fig. 7 is a schematic structural diagram of a stator core 400 according to an embodiment of the present application, in this embodiment, the stator core 400 includes a plurality of stator teeth 420 and stator yokes 430, the plurality of stator teeth 420 are arranged at intervals along a circumferential direction C of the stator core 400, the stator yokes 430 are located at one ends of the stator teeth 420 along an axial direction O, and the stator yokes 430 are used for fixing the stator teeth 420, so as to improve structural strength of the stator teeth 420 in the circumferential direction C of the stator core 400. In this embodiment, the stator core 400 is of an integral structure, and is disposed around the axial direction O of the axial motor 3, the stator teeth 420 and the stator yoke 430 are integrally formed (as shown in fig. 7), so as to improve the structural strength of the whole stator core 400, and the stator slots 410 are formed by uniformly slotting the stator core 400 along the circumferential direction C, that is, the gaps between two adjacent stator teeth 420 are the stator slots 410. The winding 500 is wound around the stator slot 410 and distributed around the stator core 400 to form a distributed winding 500, and a part of the stator core 400 located at the bottom side of the stator slot 410 constitutes the stator yoke 430. The arrangement of the windings 500 in the stator slots 410 may make the windings 500 more firmly wound with the stator core 400, improving the overall structural strength of the axial motor stator 4. The circumferential direction C of the stator core 400 is a circumferential direction around the axial direction O of the stator core 400, and the stator core 400 is disposed coaxially with the axial motor 3, and the axial direction O of the stator core 400 is the axial direction O of the axial motor 3.
Referring to fig. 8, fig. 8 is a schematic view of a part of a structure of a stator tooth 420 and a stator yoke 430 provided in another embodiment of the present application, in another embodiment, the stator tooth 420 and the stator yoke 430 are separately disposed (as shown in fig. 8), the stator yoke 430 is used to fix the stator teeth 420, so that a plurality of stator teeth 420 are relatively fixed in a circumferential direction, a stator slot 410 is provided between two adjacent stator teeth 420, and a winding 500 is wound on each stator core 400 to form a winding type winding 500. Fig. 8 illustrates only a schematic structure of a part of the stator teeth 420 and a part of the stator yoke 430. In one embodiment, the stator yoke 430 is ring-shaped, and a through hole penetrating the stator yoke 430 is provided along the circumferential direction, and one end of the stator teeth 420 is inserted into the through hole, so that the plurality of stator teeth 420 are arranged at intervals along the circumferential direction. In other embodiments, the structure of the stator yoke 430 may be other structures as long as the stator teeth 420 can be fixed in the circumferential direction, not limited to the structures shown in fig. 7 and 8.
It should be noted that fig. 4, 5, 7 and 8 only schematically illustrate the basic form of the stator slots 410 in the axial motor stator 4, and do not limit the size, number, distribution pitch and depth of the stator slots 410, and those skilled in the art can design the size, number, distribution pitch and depth of the stator slots 410 according to actual requirements, which is not limited in this application.
Referring to fig. 9, fig. 9 is a partial enlarged view of an axial motor stator 4 according to an embodiment of the present application, wherein a magnetic slot wedge 600 is disposed in a stator slot 410 and is located in a notch of the stator slot 410, and a winding 500 is located closer to a bottom of the stator slot 410 than the magnetic slot wedge 600. The magnetic slot wedge 600 comprises a magnetic conduction section 610 and a magnetism isolating section 620, wherein the magnetic conduction section 610 is beneficial to magnetic conduction and provides a magnetic conduction path for magnetic force lines L generated by the winding 500 during operation. Since the stator slots 410 are formed in the stator core 400 by slotting in order to wind the windings 500, the stator core portions in the stator slots 410 are removed, the magnetic permeability is reduced, and the magnetic permeability is improved by providing the magnetic conductive segments 610 in the stator slots 410, thereby increasing the portions capable of conducting magnetic. Wherein, both side walls along the circumferential direction C of the stator core 400 in the stator slot 410 are connected with a part of the magnetic conductive section 610, wherein the part of the magnetic conductive section 610 connected with one side of the stator slot 410 is used for compensating the magnetic conductive part of the stator teeth 420 at the same side. As shown in fig. 9, the stator teeth on both sides of the stator slot 410 are respectively denoted as a first stator tooth 420a and a second stator tooth 420b, wherein a portion of the magnetic conduction section 610 near the first stator tooth 420a is used for increasing the magnetic conduction path of the first stator tooth 420a, and a portion of the magnetic conduction section 610 near the second stator tooth 420b is used for increasing the magnetic conduction path of the second stator tooth 420b, so that the magnetic force line L generated by the winding 500 can enter the air gap through the portion of the magnetic conduction section 610, thereby improving the magnetic conduction effect and improving the air gap magnetic flux.
The magnetism isolating section 620 is used for isolating magnetic force lines to transmit so as to avoid mutual crosstalk of magnetic force lines L on two sides of the stator slot 410. In the circumferential direction C of the stator core 400, the magnetism isolating sections 620 are located between the partial magnetism conducting sections 610 on both sides, so that the magnetism isolating sections 620 have the partial magnetism conducting sections 610 between the magnetism isolating sections 620 and the slot wall on one side of the stator slot 410. As shown in fig. 9, a part of magnetic conduction section 610 is provided between the magnetism isolating section 620 and the first stator teeth 420a, and a part of magnetic conduction section 610 is provided between the magnetism isolating section 620 and the second stator teeth 420b, and the magnetism isolating section 620 blocks the magnetic force lines L in the first stator teeth 420a from being transmitted to the second stator teeth 420b, so that more magnetic force lines L enter an air gap, and the air gap magnetic flux is lifted, so that the torque of the axial motor 3 can be lifted.
In the present embodiment, by providing the magnetic slot wedge 600, on the one hand, the winding 500 can be pressed in the stator slot 410, so as to prevent the winding 500 from being displaced in the stator slot 410, thereby causing mechanical abrasion; on the other hand, the magnetic slot wedge 600 is divided into the magnetic conduction section 610 and the magnetism isolating section 620, wherein, since the magnetic conduction section 610 is more beneficial to the circulation of magnetic force lines L than air, the magnetic slot wedge 600 has the function of guiding magnetic flux, reducing magnetic flux loss, and the magnetism isolating section 620 in the magnetic slot wedge 600 can prevent the magnetic force lines L generated by the winding 500 from entering the adjacent stator teeth 420 along the two sides of the circumferential direction C through the magnetic slot wedge 600, thereby preventing magnetic crosstalk between the adjacent stator teeth 420. The magnetic conducting section 610 and the magnetic isolating section 620 of the magnetic slot wedge 600 cooperate together to increase the density of the magnetic lines of force L generated by the winding 500 entering the air gap Q.
In one embodiment, the slot bottom of the stator slot 410 is rectangular, and the width of the slot along the circumferential direction C of the stator core 400 is set according to the size of the coil used for the winding 500. The winding 500 may be a flat wire winding, and compared with a round wire winding, the flat wire winding has a high slot filling rate, that is, a gap left when the flat wire winding 500 is located in the stator slot 410 is smaller, so that the risk of magnetic flux leakage of the magnetic force lines of the winding 500 from the gaps in the stator slot 410 can be reduced, the axial motor 3 adopting the flat wire winding 500 has relatively higher efficiency, and the flat wire winding has a better heat dissipation performance due to the high slot filling rate, so that the efficiency of the axial motor 3 can be improved. However, because the size of the flat wire winding 500 is relatively large, the requirement on the opening width of the stator slot 410 is correspondingly higher, so that the magnetic leakage at the slot opening is serious, and the problem of the magnetic leakage of the flat wire winding 500 in the circumferential direction of the slot opening of the stator slot 410 can be effectively solved by adopting the magnetic slot wedge 600 in the application, so that the magnetic slot wedge 600 and the flat wire winding 500 can be mutually matched with each other efficiently, and the power density of the axial motor 3 is jointly improved. Among other things, the flat wire winding 500 includes, but is not limited to, the following types: lap windings, concentric windings, wave windings, chain windings or cross windings. In other embodiments, the winding 500 may also be a round wire winding, in case the power requirement of the axial motor 3 is fulfilled.
In an embodiment, adhesive is filled between the magnetic conductive section 610 and the slot wall of the stator slot 410 to enhance the reliability of the connection between the magnetic conductive section 610 and the stator slot 410 and enhance the structural strength of the axial motor stator 4.
In the application, through the arrangement of the magnetic slot wedge 600 in the axial motor 3, the magnetic force lines generated by the winding 500 are led to enter the air gap by the magnetic conduction section 610 of the magnetic slot wedge 600, so that the magnetic flux density of the air gap is increased, the waveform of the magnetic flux density of the air gap is close to a sine wave, the output torque can be increased, the torque fluctuation is reduced, and the problem of circumferential magnetic leakage at the notch of the stator slot 410 is effectively solved;
second, the two sides of the magnetic conduction section 610 are connected with the slot walls of the stator slots 410, which is equivalent to increasing the effective sectional area of the stator teeth 420, thereby being beneficial to reducing magnetic resistance and increasing magnetic conduction paths;
third, the magnetism isolating section 620 of the magnetic slot wedge 600 is located between the partial magnetic conducting sections 610 in the circumferential direction C of the stator core 400, so that magnetic field interference in adjacent stator teeth 420 can be avoided, and meanwhile, the magnetism isolating section 620 is beneficial to ensuring the overall strength of the magnetic slot wedge 600, so that the magnetic slot wedge 600 is less influenced by external environment.
This application is through adopting magnetic slot wedge 600 in axial motor stator 4 to divide into magnetic conduction section 610 and magnetism separation section 620 with magnetic slot wedge 600, make magnetic slot wedge 600 when guiding magnetic flux, avoid magnetism crosstalk, and promote the intensity of magnetic slot wedge 600, be favorable to reducing the circumference magnetic leakage of stator slot 410, and then promote axial motor 3's work efficiency.
Referring to fig. 3 and 10 in combination, fig. 10 is a schematic view of a partial structure of a magnetic slot wedge 600, a stator core 400 and a rotor 30 according to an embodiment of the present application, in one possible implementation, a dimension of a magnetism isolating section 620 in a circumferential direction C of the stator core 400 gradually increases from a notch of a stator slot 410 to a slot bottom of the stator slot 410. In one embodiment, an air gap Q (as shown in fig. 3 and 10) is provided between the axial motor stator 4 and the rotor 30, and magnetic force lines L generated in the axial motor stator 4 enter the rotor 30 through the air gap Q, and the side of the magnetic conducting section 610 and the magnetic isolating section 620 away from the bottom of the stator slot 410 is adjacent to the air gap Q. The circumferential dimension of the end, far away from the air gap Q, of the magnetism isolating section 620 is set to be larger than the circumferential dimension of the end, close to the air gap Q, of the magnetism isolating section 620, on the one hand, under the condition that the dimension of the AA' end of the magnetic slot wedge 600 in the circumferential direction of the stator core 400 is unchanged, the smaller the circumferential dimension of the end, close to the air gap Q, of the magnetism isolating section 620 is, the larger the circumferential dimension of the end, close to the air gap Q, of the magnetism conducting section 610 is compared with the magnetism isolating section 620, the magnetism conducting section 610 is helped to guide magnetic fluxes to enter the rotor 30 through the air gap Q, so that the density of magnetic force lines L generated by the winding 500 entering the air gap Q is improved, and the circumferential magnetism leakage is reduced; on the other hand, the circumferential dimension of the magnetic conductive segment 610 greatly indirectly widens the circumferential dimension of the stator teeth 420 connected with the magnetic conductive segment 610, which is beneficial to reducing magnetic resistance.
In the present embodiment, the circumferential dimension of the magnetism isolating segment 620 is D1, and D1 increases linearly from the notch of the stator slot 410 to the bottom of the stator slot 410 (as shown in fig. 10). In other embodiments, the trend of D1 from the notch of the stator slot 410 to the slot bottom of the stator slot 410 includes, but is not limited to, the following types: nonlinear increment, linear decrement, nonlinear decrement, increment-by-decrement, decrement-by-increment-unchanged.
Referring to fig. 11, fig. 11 is a top view of a magnetic slot wedge 600 and stator teeth 420 along an axial direction of a stator core 400 according to an embodiment of the present application, in one possible implementation, a dimension of the magnetic slot wedge 600 in a circumferential direction C of the stator core 400 gradually increases from inside to outside along a radial direction R of the stator core 400 (as shown in fig. 11). The stator core 400 has a ring-like structure, from inside to outside, from an inner circumferential surface of the stator core 400 to an outer circumferential surface of the stator core 400 in a radial direction R of the stator core 400. The size value of the magnetic slot wedge 600 in the circumferential direction C of the stator core 400 is D2, the D2 increases gradually from inside to outside along the radial direction R of the stator core 400, and the D2 increasing manner may be linear increasing or nonlinear increasing, or may be that a section D2 of the magnetic slot wedge 600 near the inner circumferential surface of the stator core 400 is unchanged, and a section D2 of the magnetic slot wedge 600 near the outer circumferential surface of the stator core 400 increases gradually, so long as the condition is satisfied that the D2 of the end of the magnetic slot wedge 600 near the outer circumferential surface of the stator core 400 is greater than the D2 of the end of the magnetic slot wedge 600 near the inner circumferential surface of the stator core 400. When D2 is linearly incremented, the stator slot 410 and magnetic slot wedge 600 processing is made simpler.
In the present embodiment, the size of the stator teeth 420 between two adjacent stator slots 410 in the circumferential direction C of the stator core 400 gradually increases from inside to outside along the radial direction R of the stator core 400, and the size change of the magnetic slot wedge 600 in the circumferential direction C of the stator core 400 is the same as the size change of the stator teeth 420, so that the magnetic slot wedge 600 is matched with the circumferential size change of the stator teeth 420, which is beneficial to enhancing the magnetic conduction effect of the magnetic slot wedge 600.
Referring to fig. 12, fig. 12 is a partial enlarged view of a stator core 400 and a magnetic slot wedge 600 according to an embodiment of the present application, in one possible implementation manner, a stator slot 410 includes a winding accommodating portion 411 and a slot wedge accommodating portion 412 distributed along an axial direction O of the stator core 400, the winding accommodating portion 411 is used for accommodating a portion of a winding 500, the slot wedge accommodating portion 412 is used for accommodating the magnetic slot wedge 600, a dimension of the magnetic slot wedge 600 and the slot wedge accommodating portion 412 in a circumferential direction C of the stator core 400 gradually increases from inside to outside along a radial direction R of the stator core 400, and the magnetic conductive sections 610 are connected with inner walls of the slot wedge accommodating portion 412 along two sides of the circumferential direction C of the stator core 400.
In an embodiment, the dimension of the winding housing 411 in the circumferential direction C of the stator core 400 is kept constant along the radial direction of the stator core 400, so that the winding 500 located in the winding housing 411 is not displaced, and the firmness of the winding 500 on the stator core 400 is increased.
In an embodiment, the size of the winding accommodating portion 411 in the circumferential direction C of the stator core 400 may be the same as or different from the size of the slot wedge accommodating portion 412 in the circumferential direction C of the stator core 400, and when the sizes are the same, the processing process is simpler, and the winding accommodating portion 411 and the slot wedge accommodating portion 412 may be formed by slotting at the same time; when the dimensions of the slot wedge accommodating part 412 in the circumferential direction C of the stator core 400 are different, the dimensions of the winding accommodating part 411 in the circumferential direction C of the stator core 400 can be set to be larger than those of the slot wedge accommodating part 412 in the circumferential direction C of the stator core 400, so that the various designs of the magnetic slot wedge 600 are facilitated, and the dimensions and the shapes of the magnetic conduction section and the magnetism isolation section can be set according to the magnetic conduction and magnetism isolation effects by way of example; on the other hand, the arrangement of the circumferential side walls of the magnetic slot wedge 600 and the stator slot 410 is advantageous in that the structural strength is increased.
Referring to fig. 6 and fig. 13 to fig. 15 in combination, fig. 13 is a partially enlarged view of a stator core 400 according to an embodiment of the present application, fig. 14 is a schematic diagram illustrating connection between a stator slot 410 and a magnetic slot wedge 600 according to an embodiment of the present application, and fig. 15 is a schematic diagram illustrating connection between a stator slot 410 and a magnetic slot wedge 600 according to another embodiment of the present application. In one possible implementation manner, the stator slot 410 is provided with first clamping portions 4120 (as shown in fig. 13) along two side slot walls in the circumferential direction C of the stator core 400, and the magnetically conductive segment 610 is provided with second clamping portions 612 (as shown in fig. 6) along two sides in the circumferential direction C of the stator core 400, where the first clamping portions 4120 and the second clamping portions 612 are in clamping connection (as shown in fig. 14 and 15). The first latching portion 4120 is matched with the shape of the second latching portion 612, and illustratively, the first latching portion 4120 is a concave portion, the second latching portion 612 is a convex portion (as shown in fig. 14), or the first latching portion 4120 is a convex portion, the second latching portion 612 is a concave portion (as shown in fig. 15), and the first latching portion 4120 is engaged with the second latching portion 612 to enhance the overall strength of the stator core 400. During assembly, the winding 500 is first installed in the stator slot 410, and then the magnetic slot wedge 600 is pushed from outside to inside along the radial direction R of the stator core 400 in the stator slot 410, the first clamping portion 4120 and the second clamping portion 612 may be coated with an adhesive in advance, after the first clamping portion 4120 and the second clamping portion 612 are completely clamped, the first clamping portion 4120 and the second clamping portion 612 are bonded by the adhesive, so that the structural reliability of the axial motor stator 4 is enhanced, the structural strength is improved, and in other embodiments, the first clamping portion 4120 and the second clamping portion 612 may be connected by adopting a pin, a buckle, a screw or other connection modes.
Referring to fig. 16 and 17, fig. 16 is a schematic structural diagram of an end face of a magnetic slot wedge 600 according to an embodiment of the present application, and fig. 17 is a partial enlarged view of an axial motor stator 4 according to an embodiment of the present application, in one possible implementation, a magnetic conductive segment 610 includes two magnetic conductive sub-segments 613 (as shown in fig. 16), the two magnetic conductive sub-segments 613 are respectively connected with two side slot walls of a stator slot 410 along a circumferential direction C of the stator core 400 (as shown in fig. 17), and a magnetism isolating segment 620 is located between the two magnetic conductive sub-segments 613 in the circumferential direction C of the stator core 400 (as shown in fig. 17).
In the present embodiment, the two magnetically conductive sub-sections 613 are respectively connected to different stator teeth 420, so as to improve the magnetic conductivity of the stator teeth 420 at two sides of the stator slot 410. In one embodiment, the dimension D3 of the magnetic sub-segment 613 in the axial direction O of the stator core 400 is equal to the dimension D4 of the magnetic isolation segment 620 in the axial direction O of the stator core 400 (as shown in fig. 16), and the side of the magnetic isolation segment 620 near the bottom of the stator slot 410 contacts the winding 500 (as shown in fig. 17).
In the embodiment shown in fig. 16 and 17, the side surface of the magnetism isolating section 620 where the magnetism conducting sub-section 613 is connected is a plane, and the position where the magnetism isolating section 620 is connected to the magnetism conducting sub-section 613 is in a straight line shape as seen from the end surface of the magnetism isolating section 620 and the magnetism conducting sub-section 613.
Referring to fig. 18 and 19, fig. 18 is a schematic structural diagram of an end face of a magnetic slot wedge 600 provided in an embodiment of the present application, and fig. 19 is a schematic structural diagram of an end face of a magnetic slot wedge 600 provided in an embodiment of the present application, in other embodiments, a side face of a magnetic isolation section 620 connected to a magnetic sub-section 613 is an irregular surface, and a position of the magnetic isolation section 620 connected to the magnetic sub-section 613 is in a non-linear shape when seen from the end face of the magnetic isolation section 620 and the magnetic sub-section 613. Illustratively, from the end surfaces of the magnetism isolating section 620 and the magnetism conducting sub-section 613, the connecting position of the magnetism isolating section 620 and the magnetism conducting sub-section 613 is a fold line (as shown in fig. 18) or an arc line (as shown in fig. 19). The side surface of the magnetism isolating section 620 connected with the magnetism conducting sub-section 613 is an irregular surface, and compared with a plane, the contact area between the magnetism isolating section 620 and the magnetism conducting sub-section 613 is larger, so that the magnetism isolating section 620 is more firmly connected with the magnetism conducting sub-section 613, and the whole strength of the magnetic slot wedge 600 is improved.
In the present embodiment, an adhesive is filled between the magnetism isolating section 620 and the magnetism conducting sub-section 613 to enhance the reliability of the connection between the magnetism isolating section 620 and the magnetism conducting sub-section 613.
Referring to fig. 20 and 21, fig. 20 is a schematic structural diagram of an end face of a magnetic slot wedge 600 according to an embodiment of the present application, and fig. 21 is a partial enlarged view of an axial motor stator 4 according to an embodiment of the present application, in a possible implementation, a surface of a magnetic conductive segment 610 near a notch of a stator slot 410 is provided with a groove 614 (as shown in fig. 20), and a magnetism isolating segment 620 is located in the groove 614.
In the present embodiment, the portions of the magnetic conductive segments 610 in the grooves 614 near two sides of the groove wall of the grooves 614 are located at two sides of the magnetism isolating segment 620 along the circumferential direction C of the stator core 400 (as shown in fig. 21), the bottom of the magnetic conductive segment 610 abuts against the winding 500, or the portion of the magnetic conductive segment 610 corresponding to the groove bottom of the grooves 614 abuts against the winding 500 (as shown in fig. 21). The dimension D3 of the magnetically permeable segment 610 in the axial direction O of the stator core 400 is greater than the dimension D4 of the magnetically permeable segment 620 in the axial direction O of the stator core 400 (as shown in fig. 20). By providing grooves 614 in the magnetic conductive segment 610, the difficulty in machining and manufacturing the magnetic slot wedge 600 is reduced.
In the present embodiment, an adhesive is filled between the magnetism isolating section 620 and the groove 614 of the magnetic conducting section 610 to enhance the reliability of the connection between the magnetism isolating section 620 and the magnetic conducting section 610.
In the embodiment shown in fig. 20, the end surfaces of the grooves 614 are circular arcs, and the cross-section of the grooves 614 is circular arcs. The processing of the magnetic conduction section 610 is facilitated, the surface of the magnetic conduction section 610 facing the groove 614 is more beneficial to be added into an arc shape, the connecting surface of the magnetic conduction section 610 and the groove 614 is more attached, and the connecting strength is higher.
Referring to fig. 22 and 23, fig. 22 is a schematic structural diagram of an end face of a magnetic slot wedge 600 according to an embodiment of the present application, and fig. 23 is a schematic structural diagram of an end face of a magnetic slot wedge 600 according to an embodiment of the present application, in some embodiments, an end face of a groove 614 or a cross section of the groove 614 may be irregularly curved, triangular (as shown in fig. 22) or trapezoidal (as shown in fig. 23). In other embodiments, the shape of the grooves 614 may be set as desired, and is not limited to the shape shown in fig. 20, 22, and 23.
Referring to fig. 24, fig. 24 is a schematic structural diagram of an end face of a magnetic slot wedge 600 according to an embodiment of the present application, in one possible implementation, a magnetically conductive segment 610 has anisotropy, and an angle value of an angle between an easy axis P of the magnetically conductive segment 610 and an axial direction O of the stator core 400 is less than or equal to 60 degrees.
The anisotropy refers to a property that all or part of chemical, physical and other properties of a substance change with a change in direction, and the property shows a difference in different directions. Magnetic anisotropy refers to the phenomenon in which the magnetic properties of a substance change with direction. The easy axis P is a direction in which a substance having magnetic anisotropy is preferentially magnetized when magnetized. The detection method of the easy axis P comprises the following steps: and (3) placing the object to be measured in an alternating magnetic field along 360 degrees, and measuring the magnetic field intensity value or the magnetic flux value of the object to be measured before and after the object to be measured is placed in the alternating magnetic field, wherein the direction corresponding to the maximum change of the magnetic field intensity value or the magnetic flux value of the alternating magnetic field is the direction of the easy axis P.
In one embodiment, the anisotropic conductive section 610 is made from anisotropic magnetic powder in combination with a molding technique. The anisotropic magnetic powder is a soft magnetic composite material, such as a planar anisotropic material of yttrium iron silicon YFeSi, cerium iron nitrogen CeFeN and the like, and can guide magnetic flux to a specific direction, and the magnetic loss is extremely low due to different magnetic directions. The mould pressing technology is to mix and compact the magnetic powder and the non-magnetic heat-resistant adhesive, and press the mixture into any shape and number of layers. Among them, heat-resistant adhesives include, but are not limited to, epoxy-based, phenolic-based, silicone-based, and heterocyclic-based adhesives. In an embodiment, the material of the magnetic isolation section 620 may be a heat-resistant adhesive, a high-temperature adhesive, a plasticizer, or the like. The magnetic permeability of the magnetism isolating section is lower than that of the magnetism conducting section.
In this embodiment, the angle value of the angle between the easy axis P of the magnetic conductive section 610 and the axial direction O of the stator core 400 is α, α is less than or equal to 60 °, and the magnetic force lines generated by the winding 500 are guided to deviate toward the adjacent stator teeth 420 after passing through the magnetic conductive section 610, so that the air gap magnetic flux density waveform approximates to a sine wave, the magnetic leakage at the notch of the stator slot 410 is reduced, and the output torque is increased. Referring to fig. 25, fig. 25 is a schematic structural diagram of an end face of a stator tooth 420 and a magnetic slot wedge 600 provided in an embodiment of the present application, the magnetic conduction section 610 includes two magnetic conduction subsections, which are respectively recorded as a first magnetic conduction subsection 613a and a second magnetic conduction subsection 613b, wherein the first magnetic conduction subsection 613a is disposed adjacent to the first stator tooth 420a on the left side of the stator slot 410, the second magnetic conduction subsection 613b is disposed adjacent to the second stator tooth 420b on the right side of the stator slot 410, an easy axis P of the first magnetic conduction subsection 613a forms an included angle with an axial direction O of the stator core 400, and is biased towards the first stator tooth 420a, an easy axis P' of the second magnetic conduction subsection 613b forms an included angle with the axial direction O of the stator core 400, and is biased towards the second stator tooth 420b, the first magnetic conduction subsection 613a can guide the magnetic force line L to be close to the first stator tooth 420a, and the second magnetic conduction subsection 613b can guide the magnetic line L to be close to the second stator tooth 420a, so that the magnetic line L in the first stator tooth 420a is more concentrated, and the second magnetic line density is closer to the second magnetic line 420b, and the magnetic line density is closer to 3.
In this embodiment, the magnetic slot wedge 600 is set to have anisotropy, so that the magnetic leakage in the circumferential direction C can be reduced to the greatest extent, the axial magnetic flux in the air gap Q is fully utilized, and the power density of the axial motor 3 is improved.
The specific angle value of the angle between the easy axis P of the magnetic conductive segment 610 and the axial direction O of the stator core 400 may be set according to needs, for example, the angle value α is 30 °, 45 °, etc.
Referring to fig. 26, fig. 26 is a schematic structural diagram of an end face of a magnetic slot wedge 600 according to an embodiment of the present application, and in one possible implementation, an easy axis P of a magnetic conductive section 610 is the same as an axial direction O of a stator core 400. At this time, the angle α between the easy axis P of the magnetic conductive section 610 and the axial direction O of the stator core 400 is 0, which is beneficial to process preparation, processing and testing.
Referring to fig. 27, fig. 27 is a schematic structural diagram of an end face of a magnetic slot wedge 600 according to an embodiment of the present application, in one possible implementation manner, a portion of a magnetic conductive section 610 located between a slot wall of a stator slot 410 and a magnetism isolating section 620 includes a first magnetic conductive portion 615 and a second magnetic conductive portion 616, and in a circumferential direction C of a stator core 400, the second magnetic conductive portion 616 is located between the first magnetic conductive portion 615 and the magnetism isolating section 620; in the end surface or the cross section of the magnetic slot wedge 600, the easy axis P1 of the first magnetic conduction portion 615 and the easy axis P2 of the second magnetic conduction portion 616 deviate from the axial direction O of the stator core 400 in the direction away from the magnetism isolating section 620, and an included angle γ between the easy axis P2 of the second magnetic conduction portion 616 and the axial direction O of the stator core 400 is larger than an included angle β between the easy axis P1 of the first magnetic conduction portion 615 and the axial direction O of the stator core 400.
In the present embodiment, the magnetic conductive section 610 has the function of guiding the magnetic force line L, and the easy axis P1 of the first magnetic conductive portion 615 and the easy axis P2 of the second magnetic conductive portion 616 are the direction of magnetic force line offset, so the magnetic force line L is offset from the axial direction O of the stator core 400 in the direction away from the magnetism isolating section 620 after passing through the first magnetic conductive portion 615 and the second magnetic conductive portion 616. The first magnetic conductive portion 615 is located between the stator teeth 420 and the second magnetic conductive portion 616, the second magnetic conductive portion 616 is offset from the stator teeth 420 in the circumferential direction C of the stator core 400 compared with the first magnetic conductive portion 615, but in this embodiment, an included angle between the easy axis P1 of the first magnetic conductive portion 615 and the axial direction O of the stator core 400 is β, and an included angle between the easy axis P2 of the second magnetic conductive portion 616 and the axial direction O of the stator core 400 is γ, γ > β, so that the magnetic force lines L conducted by the second magnetic conductive portion 616 are offset toward the stator teeth 420, and further the magnetic force lines generated by the winding 500 are concentrated, so that the magnetic density waveform passing through the air gap is close to a sine wave, and the output torque can be increased, and the torque fluctuation is reduced. In fig. 27, the shapes of the first magnetic conductive portion 615 and the second magnetic conductive portion 616 are not limited to those shown in fig. 27, and the shapes and the sizes of the first magnetic conductive portion 615 and the second magnetic conductive portion 616 may be specifically set as needed.
Referring to fig. 28, fig. 28 is a schematic structural diagram of the end surfaces of the stator teeth 420 and the magnetic slot wedge 600 according to an embodiment of the present application, in one possible implementation, when the magnetism isolating section 620 is located in the groove 614 in the magnetism isolating section 610, an angle epsilon of deviating the easy axis P4 of the magnetism isolating section 610 near the magnetism isolating section 620 from the axial direction O of the stator core 400 toward the slot wall direction of the stator slot 410 is larger than an angle delta of deviating the easy axis P3 of the magnetism isolating section 610 far from the magnetism isolating section 620 from the axial direction O of the stator core 400. As shown in fig. 28, 610b represents a part of the magnetic conductive segment near the magnetic isolation segment 620, 610a represents a part of the magnetic conductive segment far away from the magnetic isolation segment 620, the easy axis P4 of 610b deviates from the axial direction O of the stator core 400 toward the slot wall direction of the stator slot 410 by an angle epsilon of the easy axis P4 in fig. 28 and the axial direction O of the stator core 400, the easy axis P3 of 610a deviates from the axial direction O of the stator core 400 toward the slot wall direction of the stator slot 410 by an angle delta of the easy axis P3 in fig. 28 and the axial direction O of the stator core 400, and epsilon is set to be larger than delta, so that the magnetic force lines L conducted through 610b deviate toward the stator teeth 420, and the magnetic force lines generated by the winding 500 are concentrated, and the magnetic density waveform passing through the air gap approaches to a sine wave, so that the output torque can be increased, and the torque fluctuation can be reduced. It should be noted that 610a and 610b shown in fig. 28 do not represent actual areas and volumes, and may be set as required, and 610a and 610b are merely used to illustrate the distance relationship from the magnetism isolating section 620.
Referring to fig. 3 and 29 in combination, fig. 29 is a schematic structural diagram of an axial motor stator 4 according to an embodiment of the present application, in one possible implementation manner, a stator slot 410 penetrates through two ends of an axial direction O of a stator core 400, two magnetic slot wedges 600 are disposed in the stator slot 410, a partial winding 500 is disposed between the two magnetic slot wedges 600, and the two magnetic slot wedges 600 are respectively connected with slot walls of the stator slot 410.
This embodiment is applicable to the case where the axial motor 3 includes an axial motor stator 4 and two rotors 30 (as shown in fig. 3), the two rotors 30 are both mounted on the motor shaft 31 and fixedly connected with the motor shaft 31, the two rotors 30 are located at two sides of the axial motor stator 4 along the axial direction O of the motor shaft 31, the axial motor stator 4 and the two rotors 30 are coaxially arranged, an air gap is formed between the axial motor stator 4 and the two rotors 30, one side of the two magnetic slot wedges 600 away from the winding 500 is in direct contact with the air gap, and magnetic force lines generated by the winding 500 enter the rotors 30 through the air gap.
In the present embodiment, two magnetic slot wedges 600 press the winding 500 from both sides of the stator core 400 in the axial direction O of the stator core 400, preventing the winding 500 from being displaced in the stator slot 410. During assembly, the winding 500 is firstly installed in the stator slot 410, then the two magnetic slot wedges 600 are respectively pushed in the radial direction R of the stator core 400 from outside to inside at two notches of the stator slot 410, and after the first clamping part 4120 and the second clamping part 612 are completely clamped, the adhesive is filled between the first clamping part 4120 and the second clamping part 612, so that the structural reliability of the axial motor stator 4 is enhanced, and the structural strength is improved. In this embodiment, magnetic slot wedges 600 are respectively disposed on two sides of the stator slot 410 along the axial direction O, so that magnetic force lines generated by the winding 500 can be guided to be gathered by the magnetic slot wedges 600 along the axial direction O of the stator core 400, and air gap flux density is increased.
The axial motor, the power assembly and the electric equipment provided by the embodiment of the application are described in detail, and specific examples are applied to the description of the principles and the embodiments of the application, and the description of the embodiments is only used for helping to understand the method and the core idea of the application; meanwhile, as those skilled in the art will have modifications in specific embodiments and application scope in accordance with the ideas of the present application, the present disclosure should not be construed as limiting the present application in view of the above description.

Claims (10)

1. An axial motor is characterized by comprising an axial motor stator, wherein the axial motor stator comprises a stator core, a winding wound on the stator core and a magnetic slot wedge;
the stator core is provided with stator grooves which are arranged at intervals along the circumferential direction of the stator core, the stator grooves extend along the radial direction of the stator core, and part of the windings are positioned in the stator grooves;
the magnetic slot wedge is located in the stator slot and extends along the radial direction of the stator core, the magnetic slot wedge is closer to the notch of the stator slot than the partial winding located in the stator slot, the magnetic slot wedge comprises a magnetic conduction section and a magnetism isolating section, the magnetic conduction section is located in the stator slot and connected with the two side slot walls of the stator slot along the circumference of the stator core, and the magnetism isolating section is located between partial magnetic conduction sections in the circumferential direction of the stator core.
2. The axial motor of claim 1, wherein the dimension of the magnetism blocking section in the circumferential direction of the stator core becomes gradually larger from the notch of the stator slot to the slot bottom of the stator slot.
3. The axial motor according to claim 1 or 2, wherein a dimension of the magnetic slot wedge in a circumferential direction of the stator core becomes gradually larger from inside to outside in a radial direction of the stator core.
4. An axial motor according to any one of claims 1-3, wherein the stator slot is provided with first clamping portions along two side slot walls in the circumferential direction of the stator core, the magnetically conductive section is provided with second clamping portions along two sides in the circumferential direction of the stator core, and the first clamping portions and the second clamping portions are in clamping connection.
5. The axial motor as claimed in any one of claims 1-4, wherein the magnetically permeable segment includes two magnetically permeable sub-segments respectively connected to both side slot walls of the stator slot in the circumferential direction of the stator core, the magnetically permeable segment being located between the two magnetically permeable sub-segments in the circumferential direction of the stator core.
6. The axial motor of any one of claims 1-4, wherein the surface of the magnetically permeable segment adjacent the stator slot opening is provided with a recess, and the magnetically isolated segment is positioned within the recess.
7. The axial motor of any one of claims 1-6, wherein the magnetically permeable segment has anisotropy, and an angle value of an angle between an easy axis of the magnetically permeable segment and an axial direction of the stator core is less than or equal to 60 degrees.
8. The axial motor of any one of claims 1-7, wherein the stator slot penetrates through two axial ends of the stator core, two magnetic slot wedges are arranged in the stator slot, a part of the winding is positioned between the two magnetic slot wedges, and the two magnetic slot wedges are respectively connected with slot walls of the stator slot.
9. The power assembly is characterized by comprising a gearbox and the axial motor as claimed in any one of claims 1-8, wherein the axial motor further comprises an axial motor rotor and a motor shaft which are fixedly connected, the axial motor rotor and the axial motor stator are arranged along the axial direction of the motor shaft and are sleeved on the motor shaft, the axial motor rotor and the motor shaft can rotate relative to the axial motor stator, and the motor shaft is in transmission connection with a power input shaft of the gearbox and is used for outputting power to the power input shaft.
10. An electrically powered device comprising a device body and an axial motor as claimed in any one of claims 1 to 8, the axial motor being mounted to the device body; or alternatively
The electrically powered device comprising a device body and the powertrain of claim 9 mounted to the device body.
CN202222854078.2U 2022-10-27 2022-10-27 Axial motor, power assembly and electric equipment Active CN218920111U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202222854078.2U CN218920111U (en) 2022-10-27 2022-10-27 Axial motor, power assembly and electric equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202222854078.2U CN218920111U (en) 2022-10-27 2022-10-27 Axial motor, power assembly and electric equipment

Publications (1)

Publication Number Publication Date
CN218920111U true CN218920111U (en) 2023-04-25

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Family Applications (1)

Application Number Title Priority Date Filing Date
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CN (1) CN218920111U (en)

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